Wow my area is expensive $600 per zone of 10k. (3 zones in my county, 10 zones in my service area). I think there is some kind of discounts for more zones. It never really did well enough for me to experiment with more zones.
Depends on your offer, demand, the neighborhoods it`s going to, graphics etc. If you are giving away $100 bills you`ll get a great response, if your selling ketchup popsicles to Eskimos in January you`ll probably get a poor response.